Imaginary Numbers

Yes. I don't believe that there are any exceptions.

Anonymous2:

[color=#FF00FF]All square roots of a negative number are imaginary, right? [/color]

SnowRobin is correct

eg
sqrt(-4) = sqrt(4) x sqrt(-1) => 2 x i => 2i

i is the base unit of imaginary numbers.
i= sqrt(-1)